Cutter-head



' tempered steel bar of the length of the knife,

NTTED STATES PATENT OEEICE. I

BENJAJNIIN F. LANTERMAN, OF CHICAGO, ILLINOIS.

CUTTER-H EAD.

.SPECIFICATION forming part of Letters lPatent No. 286,450, dated October 9, 1883.

Application filed March 29, 1882. (No model.)

To @Z5 whom it may concern.-

Be it known that I, BENJAMIN F. LANTER- MAN, a citizen of the United States, residing at Chicago, inV the county of Cook and State of Illinois, have invented a new and. useful Improvement in VVood-Planing Machines, of which the following is a specification.

My invention relates to the cutters of woodplaning machines, in which a revolving head or holder carrying the knives operates in conjunction with machinery moving the material to be planed; and the object of the improvement is to overcome the necessity of grinding away unnecessary material in the process of sharpening the knife.

The invention consists in the employment of an extremely thin knife and an improved means of holding it to the cutter head, las shown in the accompanying drawings, in whichi Figure 1 represents an end view of the cutter-head, and Fig. 2 a sectional plan of the same.

In carrying out my invention I use the ordinary revolving prismatic head, A,secured to a shaft, with which it rotates. This head is usually made square, as shown, to the faces of which I secure the cutting-knife C, which consists of a thin strip of tempered steel having a beveled sharpened edge projecting over the face of the cutter-head.- The knife di'ers from an ordinary planer-knife in having no holes or slots for bolts, but is secured bythe pressure of the clamp B b acting on the knife at a point immediately back of its proj eeting sharpened edge, and placed forward of the bolts. A

The clamp, as shown at B b, consists of a but considerably wider, having holes through which bolts d are inserted for the purpose of holding it to the cutter and cutter-head, and a beveledforward edge, b, which, when in place, forms a continuation of the beveled edge of the knife. The clamp is made to press firmly on the knife immediately back of the edge of the cutter-head and close to the c utting-edge of the knife by means of the single set of screw-bolts d, and to insure this result the under side of the clampis removed from A contact with either the knife or head, except at its outer edges, the forward edge resting near the knife-edge and the rear portion on the back portion of the revolving head. This may be effected by hollowing the under side of the clamp or raising the rear of the cutterhead, as at shoulder I); or a combination of both methods may be employed, as desired. It will be evident that with this mode of constructing the clamp the pressure of the bolts is made to act at the point where it is most effective, and constitutes a re-enforce to the knife, making it as stiff as if the clamp and knife were one piece, instead of being distributed over the greater part of the knifes surface, and particularly the rear portion, which is the result when the clamp and head are not in this manner adj usted. Thus the necessity for bolt-holes in the knife is dispensed with and the use of an extremely thin knife rendered possible, which can be readily iiled to the proper degree of sharpness without the necessity of removal and grinding away a use; less amount of material, which is the common methodat the present time.

I am aware vthat clamps have been heretofore employed to hold the knife in its place on planer-heads; but, so far as I am aware, none of them have clamped the knife along its back, immediately behind the cutting-edge, directly upon the cutter-head with a single set of bolts.

I claim as my invention- 1. The prismatic solid cutter-head A, combined with the clamp-plate B, concavo-convex in cross-section, and the single series of clamp-` ing-screws d, arranged along the median line shoulder, and the single series of clamp-bolts,

d, substantially as shown. Y

`BENJAMIN F. LANTERMAN. Witnesses:

Trios. B. JEFFERY, P. M. LANTERMAN. 

